The most effective ways to boost fertility involve changes to diet, body weight, exercise habits, and environmental exposures, and most of these changes take about three months to fully show results. That timeline matters because sperm take roughly 72 to 90 days to mature, and egg development follows a similar window. Whether you’re just starting to try or have been at it for a while, the steps below apply to both partners.
Eat a Mediterranean-Style Diet
A diet rich in vegetables, fruits, whole grains, fish, olive oil, and legumes is consistently linked to higher conception rates. In a study of women under 35 undergoing IVF, those with the highest adherence to a Mediterranean diet had a 50% clinical pregnancy rate compared to 29% among those with the lowest adherence. Live birth rates showed a similar gap: 49% versus 27%. These findings held even after adjusting for age and other health factors.
The benefits aren’t limited to fertility treatments. A separate study found that each incremental improvement in diet quality was associated with a 65% increase in the likelihood of an ongoing pregnancy. You don’t need to overhaul everything overnight. Swapping processed snacks for nuts, cooking with olive oil instead of butter, eating fish twice a week, and adding more vegetables to meals gets you most of the way there.
Reach a Fertility-Friendly Weight
Body weight has a U-shaped relationship with fertility. Being too far in either direction increases the risk of infertility, but the data points to a surprisingly specific inflection point: a BMI of about 19.5. Below that number, each one-unit increase in BMI reduces infertility risk by 33%. Above it, each one-unit increase raises the risk by about 3%. That 3% per unit adds up quickly. A woman with a BMI of 30 faces a meaningfully higher risk than someone at 22.
If you’re underweight, gaining even a small amount of weight can restore ovulation. If you’re overweight, losing 5 to 10% of your body weight often improves hormonal balance enough to make a difference. The goal isn’t a perfect number on the scale. It’s getting into a range where your reproductive hormones can function normally.
Exercise in Moderation
Regular physical activity supports fertility, but there’s a clear point where more becomes counterproductive. Women with a normal BMI who engaged in two hours of vigorous exercise per week were 16% less likely to conceive than sedentary women over the same time frame. At three to four hours per week of vigorous exercise, that dropped to 27% less likely. Five or more hours was associated with a 32% reduction in conception chances.
The mechanism is straightforward: intense exercise can disrupt ovulation. One study found that 58% of women running about 32 kilometers per week had menstrual cycle abnormalities, including skipped ovulation, compared to just 9% of sedentary women. Moderate exercise like walking, swimming, yoga, or light cycling supports fertility without crossing into that danger zone. If you’re a serious athlete trying to conceive, dialing back intensity for a few months is one of the highest-impact changes you can make.
Track Ovulation With the Right Method
Timing intercourse to your fertile window is one of the simplest ways to improve your chances, but the method you use to identify that window matters enormously. Urine-based ovulation predictor kits, which detect a surge in luteinizing hormone, have an accuracy of 97% for detecting ovulation. A positive result typically means ovulation will occur within about 20 hours.
Basal body temperature charting, by contrast, is far less reliable. The temperature shift that signals ovulation only matched the actual hormone surge within one day in 22% of cycles. A 2005 review concluded that BBT monitoring should no longer be recommended for couples trying to conceive. If you’re choosing between the two, LH test strips are cheaper than ever and dramatically more accurate.
Start Folic Acid Early
The U.S. Preventive Services Task Force recommends that women who are planning pregnancy take 400 to 800 micrograms of folic acid daily, starting at least one month before conception and continuing through the first two to three months of pregnancy. During pregnancy itself, the recommended intake rises to 600 micrograms per day because of the increased demand for cell division and DNA synthesis.
If you’ve heard that methylfolate is a better option, especially for people with MTHFR gene variants, the CDC still recommends standard folic acid for everyone capable of becoming pregnant, including those with the common 677C>T MTHFR variant. Conversion factors for methylfolate haven’t been formally established, so folic acid remains the default recommendation.
Support Sperm Quality
Male factor issues contribute to roughly half of all fertility struggles, and the good news is that sperm quality responds well to targeted changes. Three nutrients have the strongest evidence behind them.
- Zinc: Multiple studies show improvements in sperm count, volume, and forward motility after three months of supplementation. One study found significant increases across all three measures in men with low motility.
- Selenium: In a large trial of 468 men with poor sperm parameters, selenium supplementation for 30 weeks significantly improved concentration, motility, and shape. A separate study of 690 men found a 52.6% total improvement rate in motility or shape, with 10.8% of participants achieving spontaneous pregnancy during the study.
- L-carnitine: Several trials found that L-carnitine supplementation over three to six months improved sperm motility, particularly in men whose sperm had normal antioxidant enzyme levels to begin with.
Because sperm take about three months to fully mature, any lifestyle or supplement change needs at least that long to show up in a semen analysis. This applies to quitting smoking, improving diet, or starting supplements.
Consider CoQ10 for Egg Quality
Coenzyme Q10 plays a central role in energy production inside cells, and eggs are among the most energy-demanding cells in the body. As women age, the energy-producing structures in their eggs become less efficient and more vulnerable to damage from free radicals. CoQ10 serves a dual role: it helps generate cellular energy and it neutralizes those damaging free radicals.
Clinical studies have used oral doses ranging from 180 to 1,200 milligrams per day, with 600 milligrams daily for at least two months being the most common protocol. The rationale is strongest for women over 35 or those with diminished ovarian reserve, where mitochondrial decline in eggs is a more significant factor. CoQ10 is fat-soluble, so taking it with a meal that contains some fat improves absorption.
Reduce Alcohol, Don’t Worry About Coffee
For women undergoing fertility treatment, consuming more than seven alcoholic drinks per week was associated with lower pregnancy rates. When their male partners drank at the same level, the chance of a live birth dropped by 9%. These findings likely apply to natural conception as well, since alcohol affects hormonal signaling regardless of how you’re trying to conceive.
Caffeine, on the other hand, does not appear to affect fertility for either partner. A large study found no impact on pregnancy rates or live births at typical consumption levels. If you enjoy your morning coffee, there’s no fertility-related reason to give it up.
Limit Exposure to Hormone-Disrupting Chemicals
Endocrine-disrupting chemicals mimic, block, or interfere with your body’s hormones, and reproductive hormones are especially vulnerable because they operate at extremely small concentrations. Even minor disruptions can have significant biological effects.
Two categories deserve the most attention. BPA is found in polycarbonate plastics, the lining of some canned foods and beverages, and certain food packaging. You can reduce exposure by using glass or stainless steel containers, avoiding microwaving plastic, and choosing BPA-free canned goods. Phthalates are found in hundreds of products including cosmetics, nail polish, hair spray, fragrances, and some food packaging. Choosing fragrance-free personal care products and avoiding plastic food containers, especially when heated, reduces your exposure to both.
Research has shown that phthalate exposure is associated with increased risk of preterm birth and decreased gestational age, and animal studies demonstrate that endocrine disruptors can cause changes in reproductive organs that affect fertility across generations. These chemicals are impossible to avoid entirely, but reducing your daily baseline exposure is a practical step both partners can take.